// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_RESOURCES_PLATFORM_COLOR_H_
#define CC_RESOURCES_PLATFORM_COLOR_H_

#include "base/logging.h"
#include "base/macros.h"
#include "cc/resources/resource_format.h"
#include "third_party/skia/include/core/SkTypes.h"

namespace cc {

class PlatformColor {
public:
    enum SourceDataFormat {
        SOURCE_FORMAT_RGBA8,
        SOURCE_FORMAT_BGRA8
    };

    static SourceDataFormat Format()
    {
        return SK_B32_SHIFT ? SOURCE_FORMAT_RGBA8 : SOURCE_FORMAT_BGRA8;
    }

    // Returns the most efficient texture format for this platform.
    static ResourceFormat BestTextureFormat()
    {
        switch (Format()) {
        case SOURCE_FORMAT_BGRA8:
            return BGRA_8888;
        case SOURCE_FORMAT_RGBA8:
            return RGBA_8888;
        }
        NOTREACHED();
        return RGBA_8888;
    }

    // Returns the most efficient supported texture format for this platform.
    static ResourceFormat BestSupportedTextureFormat(bool supports_bgra8888)
    {
        switch (Format()) {
        case SOURCE_FORMAT_BGRA8:
            return (supports_bgra8888) ? BGRA_8888 : RGBA_8888;
        case SOURCE_FORMAT_RGBA8:
            return RGBA_8888;
        }
        NOTREACHED();
        return RGBA_8888;
    }

    // Return true if the given 32bpp resource format has the same component order
    // as the platform color data format.
    static bool SameComponentOrder(ResourceFormat format)
    {
        switch (format) {
        case RGBA_8888:
            return Format() == SOURCE_FORMAT_RGBA8;
        case BGRA_8888:
            return Format() == SOURCE_FORMAT_BGRA8;
        case ALPHA_8:
        case LUMINANCE_8:
        case RGB_565:
        case RGBA_4444:
        case ETC1:
        case RED_8:
        case LUMINANCE_F16:
            NOTREACHED();
            return false;
        }

        NOTREACHED();
        return false;
    }

private:
    DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformColor);
};

} // namespace cc

#endif // CC_RESOURCES_PLATFORM_COLOR_H_
